Building CP2K (respectively DBCSR) with PGI 18.7 yields the following errors:

PGF90-S-0091-Constant expression of wrong data type (dbcsr_types.F90: 495)
PGF90-S-0091-Constant expression of wrong data type (dbcsr_types.F90: 495)
   0 inform,   0 warnings,   2 severes, 0 fatal for dbcsr_types

older versions of PGI 18.x may instead produce an Internal Compiler Error instead.

A support ticket is open at PGI for this very issue. Since this is valid Fortran and other compilers have no problem with this part, there is not much we can do about.

Keeping this ticket as a reminder to test newer versions of PGI once they get released.

Due to its heritage, Flang has very similar issues: flang-compiler/flang/issues/239, flang-compiler/flang/issues/360, flang-compiler/flang/issues/424